Positive Grid just pushed a firmware update, which went well for me. In the process I came across a comparison of the Positive Grid amps and pedals vs. the real-life "equivalent" or "basis". The tables show the purported basis for PG's hardware. Note the grayed-out items are part of the optional "Jimmy Hendrix" package.
What I know about amps and pedals I've learned reading here, but I can say 'fer sure that Dumble DDS50 HRM sounds way better than the others.